*update: This is not nottaripalkki. I was told this is just referred to as "riding the horse." Some of the boys at another middle school were playing at it this afternoon, and I took it upon myself to bound onto the last kid's back.*
"'Nottari' means a bridge made of human bodies and 'Palkki' means stepping.*
"When these two are put together, it carries a connotation of 'stepping over a human bridge.'
"Young women gather at a village square singing songs merrily and line up in a row. Then they bend forward, each holding the waist of the one in front with both hands and the line becomes a long stretched bridge. A girl stepping over the bridge initiates singing to be accompanied by the group's antiphony."